ipynb/examples: Update Executor example

Add "freeze_userspace" conf flag. Log output is not updated.
diff --git a/ipynb/examples/utils/executor_example.ipynb b/ipynb/examples/utils/executor_example.ipynb
index 15d2ab4..b53ae19 100644
--- a/ipynb/examples/utils/executor_example.ipynb
+++ b/ipynb/examples/utils/executor_example.ipynb
@@ -127,19 +127,19 @@
     "\n",
     "    # Platform configurations to test: you can specify any number of configurations\n",
     "    \"confs\" : [\n",
-    "        {\n",
-    "            \"tag\"            : \"base\",             # Relevant string to identify configuration\n",
-    "            \"flags\"          : \"ftrace\",           # Enable FTrace events\n",
-    "            \"sched_features\" : \"NO_ENERGY_AWARE\",  # Disable EAS\n",
-    "            \"cpufreq\"        : {                   # Use PERFORMANCE CpuFreq\n",
+    "        {  \n",
+    "            \"tag\"            : \"base\",                           # Relevant string to identify configuration\n",
+    "            \"flags\"          : [\"ftrace\", \"freeze_userspace\"],   # Enable FTrace events, freeze userspace while running            \n",
+    "            \"sched_features\" : \"NO_ENERGY_AWARE\",                # Disable EAS\n",
+    "            \"cpufreq\"        : {                                 # Use PERFORMANCE CpuFreq\n",
     "                \"governor\" : \"performance\",\n",
     "            },\n",
     "        },\n",
     "        {\n",
-    "            \"tag\"            : \"eas\",              # Relevant string to identify configuration\n",
-    "            \"flags\"          : \"ftrace\",           # Enable FTrace events\n",
-    "            \"sched_features\" : \"ENERGY_AWARE\",     # Enable EAS\n",
-    "            \"cpufreq\"        : {                   # Use PERFORMANCE CpuFreq\n",
+    "            \"tag\"            : \"eas\",                            # Relevant string to identify configuration\n",
+    "            \"flags\"          : [\"ftrace\", \"freeze_userspace\"],   # Enable FTrace events, freeze userspace while running\n",
+    "            \"sched_features\" : \"ENERGY_AWARE\",                   # Enable EAS\n",
+    "            \"cpufreq\"        : {                                 # Use PERFORMANCE CpuFreq\n",
     "                \"governor\" : \"performance\",\n",
     "            },\n",
     "        },\n",
@@ -180,7 +180,9 @@
     "    \n",
     "    # Number of iterations for each workloaditerations\n",
     "    \"iterations\" : 1,\n",
+    "}\n",
     "    \n",
+    "my_test_conf = {\n",
     "    # FTrace events to collect for all the tests configuration which have\n",
     "    # the \"ftrace\" flag enabled\n",
     "    \"ftrace\"  : {\n",
@@ -197,7 +199,7 @@
     "    \"tools\"   : [ 'trace-cmd', 'perf' ],\n",
     "    \n",
     "    # Modules required by these experiments\n",
-    "    \"modules\"     : [ 'bl', 'cpufreq' ],\n",
+    "    \"modules\"     : [ 'bl', 'cpufreq', 'cgroups' ],\n",
     "\n",
     "}"
    ]
@@ -258,7 +260,7 @@
     }
    ],
    "source": [
-    "executor = Executor(TestEnv(my_target_conf), my_experiments_conf)"
+    "executor = Executor(TestEnv(target_conf=my_target_conf, test_conf=my_test_conf), my_experiments_conf)"
    ]
   },
   {